Final answer:The expression that illustrates the investment-saving equality is (A) S = Y − C − G, representing the equation for private savings in an economy. The expanded national saving and investment identity encompasses other macroeconomic factors such as taxes, government spending, imports, and exports. Thus Option a is Correct.Explanation:The expression which shows the investment-saving equality in macroeconomics is (A) S = Y − C − G. In this equation:S is private savings,Y is national income,C is private consumption,and G is government spending.The equality shows the amount of private saving in the economy is equal to the amount of national income (Y) that is not consumed by private individuals (C) or spent by the government (G).The national saving and investment identity is based on the relationship that the total quantity supplied of financial capital from all sources must equal the total quantity demanded of financial capital demanded from all sources. The equation can be further expanded to include taxes (T), transfers (TR), imports (M), exports (X), and investment (I), leading to the expanded identity: S + (M - X) = I + (G - T). This reflects that for an economy with a current account deficit and a budget deficit, the supply of financial capital (S + M - X) equals the demand for financial capital (I + G - T)....

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